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Fertilizers
AGRI LEEDS
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Essential nutrients
• Macronutrients (large quantities):• Nitrogen, Phosphorus• Potassium, Sulfur• Carbon, calcium, magnesium• Micronutrients (small quantities):• Zinc, iron• Copper, manganese• Chlorine, molybdenum, boron etc
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Sources of nutrients
• Inorganic fertilizers (Chemical Fertilizers)
• Organic Fertilizers… Manures, composts, and other organic Materials.
• Green manures (legumes and others)
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Fertilizer label and “grade”
• N.P.K• 3 numbersal ways appear on the label• Numbers refer to:% Nitrogen (N ) % Phosphorus (P2O5)
% Potassium ( K2o )
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A few N-P-K labels out there
• 24-6-12• 16-4-8• 16-16-16• 12-12-12• 22-4-11• 22-4-14• 20-27-5• 18-5-9• 5-10-10• 9-17-9
• 34-0-0• 21-0-0• 29-3-4• 26-3-3• 28-4-4• 25-3-5• 20-2-4• 26-3-3• 25-3-5• 32-3-5
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Methods of application
• Broadcast – evenly distributed on surface
• Banding – applied in a narrow band on surface or in a furrow opened adjacent to plant row
• Foliar – applied in liquid form through Spray
• Ferttigation -- dissolve and mix in a tank a apply through Ferttegated water
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Soil pH
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Soil pH
• Soil pH: the degree of acidity or
alkalinity of soil
• The pH scale:
2 7 12
Acidic Neutral Alkaline
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Soil pH and nutrient availability
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Foliar sprays
• Spray solutions directly onto leaves
• Rapid response, but you must have
complete coverage
• May require several applications
throughout the season as new leaves emerge
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Corn: the indicator plant
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Nitrogen deficiency
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Phosphorus deficiency
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Potassium deficiency
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Iron deficiency
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Zinc deficiency
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Questions
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